Download DrTCP http://www.broadbandreports.com/faq/578 and change "TCP Receive Window" to 64240
Set "Max MTU" to 1500 and everything else to Default. Reboot and see if speed is better.
Today I tried to make my internet speed faster by using the internet tuner tool in the Ashampoo computer tool. It ended up screwing up my connection, my cable connection is now functioning at 33 kbps. I tried to do a system restore but there were no restore points. I am using a motorala surfboard modem and I am connected through comcast. If anyone can please help me fix this it would be much appreciated.